KRBN is the first US-listed ETF to provide access to the carbon allowances futures market. The fund tracks an index that provides exposure to cap-and-trade carbon allowances via futures. The index selects and weights contracts maturing in December of the next one to two years that meet minimum trading volume and dollar values, subject to limits. The index covers three major European and North American cap-and-trade programs: European Union Allowances (EUA), California Carbon Allowances (CCA), and the Regional Greenhouse Gas Initiative (RGGI). The fund also utilizes a Cayman Island subsidiary and may hold ultra-short-term, investment-grade fixed income securities as necessary collateral. Rebalancing and reconstitution is done annually in November. Prior to March 19, 2021, KRBN was named KFA Global Carbon ETF. Also, prior to December 3, 2021, the fund was named KraneShares Global Carbon ETF and was actively managed.